Labels reach edge of Masses in string tests

[Nancy-Salpepi]

Test device
MacBook Air (M1 chip)

Operating System
13.4

Browser
Safari 16.4

Problem description
For phetsims/qa#936, with stringTest=long, double, and rtl the mass labels extend to the edge of the masses.

Visuals

Troubleshooting information: !!!!! DO NOT EDIT !!!!! Name: ‫تست (زبان)‬ URL: https://phet-dev.colorado.edu/html/masses-and-springs/1.1.0-dev.2/phet/masses-and-springs_all_phet.html?stringTest=rtl Version: 1.1.0-dev.2 2023-05-02 23:06:13 UTC Features missing: applicationcache, applicationcache, touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.5 Safari/605.1.15 Language: en-US Window: 1444x709 Pixel Ratio: 2/1 WebGL: WebGL 1.0 GLSL: WebGL GLSL ES 1.0 (1.0) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 30 uniform: 1024 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 16384x16384 OES_texture_float: true Dependencies JSON: {}

[jbphet]

Unassigning and marking as "blocks-sim-publication" since the republication of this sim has been deprioritized for now. This should be addressed (at least to some degree) before republishing.