Fix code style

src/app/room-creation/room-creation.component.html

 <form (ngSubmit)="addRoom(longRoomName.value, shortRoomName.value)">
-<div fxLayout="column" fxLayoutAlign="center" fxLayoutGap="10px">
-  <mat-form-field>
-    <input matInput #longRoomName class="input-block" type="text" placeholder="Name" maxlength="50"
-           [(ngModel)]="longName"/>
-    <mat-hint align="start"><strong>Max. letters / signs:</strong></mat-hint>
-    <mat-hint align="end">{{longRoomName.value.length}} / 50</mat-hint>
-    <button mat-button *ngIf="longName" matSuffix mat-icon-button aria-label="Clear" (click)="longName=''">
-      <mat-icon>close</mat-icon>
-    </button>
-  </mat-form-field>
+  <div fxLayout="column" fxLayoutAlign="center" fxLayoutGap="10px">
+    <mat-form-field>
+      <input matInput #longRoomName class="input-block" type="text" placeholder="Name" maxlength="50"
+             [(ngModel)]="longName"/>
+      <mat-hint align="start"><strong>Max. letters / signs:</strong></mat-hint>
+      <mat-hint align="end">{{longRoomName.value.length}} / 50</mat-hint>
+      <button mat-button *ngIf="longName" matSuffix mat-icon-button aria-label="Clear" (click)="longName=''">
+        <mat-icon>close</mat-icon>
+      </button>
+    </mat-form-field>
 
-  <mat-form-field>
-    <input matInput #shortRoomName class="input-block" type="text" placeholder="Short name" maxlength="8"
-           [(ngModel)]="shortName"/>
-    <mat-hint align="start"><strong>Max. letters / signs:</strong></mat-hint>
-    <mat-hint align="end">{{shortRoomName.value.length}} / 8</mat-hint>
-    <button mat-button *ngIf="shortName" matSuffix mat-icon-button aria-label="Clear" (click)="shortName=''">
-      <mat-icon>close</mat-icon>
-    </button>
-  </mat-form-field>
-  <button mat-raised-button color="primary" type="submit">Create room
-  </button>
-</div>
+    <mat-form-field>
+      <input matInput #shortRoomName class="input-block" type="text" placeholder="Short name" maxlength="8"
+             [(ngModel)]="shortName"/>
+      <mat-hint align="start"><strong>Max. letters / signs:</strong></mat-hint>
+      <mat-hint align="end">{{shortRoomName.value.length}} / 8</mat-hint>
+      <button mat-button *ngIf="shortName" matSuffix mat-icon-button aria-label="Clear" (click)="shortName=''">
+        <mat-icon>close</mat-icon>
+      </button>
+    </mat-form-field>
+    <button mat-raised-button color="primary" type="submit">Create room</button>
+  </div>
 </form>